Checkout the HTML for a WP meta-box :
<div id="my_div" class="postbox ">
<div class="handlediv" title="Click to toggle."><br></div>
<h3 class="hndle"><span>title</span></h3>
<div class="inside">
...
</div>
</div>
If you follow that structure (and CSS classes) in your custom meta-box, the toggle will work.
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